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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.10, Part Number 78-11603-01 Rev. D0, July 2001
Chapter 1 The BPX Switch: Functional Overview
Traffic and Congestion Management
Priority Bumping
Priority Bumping (PB) is a computationally-intensive process which allows switch connections
classified as more important (based on CoS value) to “bump” connections of lesser importance. CR may
be restricted if the PB feature is enabled on a network. Both PB and CR are processor intensive. To
avoid excessive processor utilization, no new route requests will be initiated or accepted on the nodes
an active PB route traverses, until it has completed.
Blocking By Nodes That Are Not CR Enabled
The CR feature does not alter the AutoRoute messaging protocol. AutoRouting is enabled by default on
nodes that are not CR enabled. When Auto Routing is enabled on a node a backoff mechanism may be
triggered to prevent excessive collisions. When the backoff mechanism is triggered the node will be
temporarily unavaliable as a candidate for CR. This mechanism is conceptually similar to the Path
Blocking algorithm described above.
Configuration
Once all of the nodes on a network have been upgraded to Release 9.3.30, CR can be enabled on any
node by using the cnfcmparm command to set the route concurrency level to an integer value greater
than 1 but no greater than 8. Once CR has been enabled on a node, it operates automatically. CR can be
turned off on a node by specifying a concurrency level of 1. See table 1-1 and example 1-1 below.
Ta b l e 1 - 1
CLI command Parameter Description
cnfcmparm
Routing concurrency
level
This is a nodal parameter. It specifies the amount total number
of routes that can be simultaneously in progress on the node.